将数据库 XML 列数据移动到新的相关表

Question

基本上我有两个表，Teachertbl 主键为TeacherID，TeacherBlobtbl 和TeacherID 与TeacherTbl 相关，还有一个XML 列TeacherBLOB。

TeacherBLOB XML 数据包含教师数据，例如他们的班级和学生。

表的架构如下所示：

TeacherTbl：

TeacherID int PRIMARY KEY    
-- Other columns

TeacherBlobTbl：

TeacherID int FOREIGN KEY REFERENCES TeacherTbl (TeacherID)
TeacherBlob xml

TeacherBlob 中的 XML 示例如下所示：

<Teacher>
. . .
    <TeacherClass>
        <FormRoom> Room A</FormRoom>
        <TotalStudents> 25 </TotalStudents>
        <Subject> Mathematics </Subject>
            <Student>
                <StudentName> James </StudentName>
                <StudentAge> 15 </StudentAge>
                <StudentAddress> </StudentAddress>
            </Student>
    </TeacherClass>
</Teacher>

基本上我想获得TeacherClass 和Student 并将它们移动到自己的表中。我想抓取TeacherClass，它的数据到一个新表中，外键与TeacherTbl 相关。

除此之外，我还想获取与StudentClass 关联的每个Student，并将其移动到它自己的表中，并使用与TeacherClass 相关的外键。

注意：我不想将Teacher移动到自己的表中，我只关心TeacherClass和Student。

它应该如下所示：

TeacherClasstbl：

TeacherClassID int PRIMARY KEY
FormRoom VARCHAR(50)
TotalStudents int
Subject VARCHAR(100)
TeacherID int FOREIGN KEY REFERENCES TeacherTbl(TeacherID)

学生：

StudentID int PRIMARY KEY
StudentName VARCHAR(50)
StudentAge int
StudentAddress VARCHAR(100)
TeacherClass int FOREIGN KEY REFERENCES TeacherClassTbl(TeacherClassID)

还值得注意的是，并非每个 XML Teacher 都会有一个关联的 TeacherClass 元素，并且该解决方案需要满足传入 TeacherBlobTbl 的新数据。

请告诉我可以用来实现此目的的任何工具/技术。

我想过做一个按计划运行的存储过程，不确定是否有更好的解决方案。

谢谢！

Answer 1

我建议将每个级别读入临时表表并从那里实际传输：

我使用声明的表变量来模拟您的测试场景

DECLARE @Teacher TABLE(TeacherID INT IDENTITY,Name VARCHAR(100));
INSERT INTO @Teacher VALUES('Teacher 1'),('Teacher 2');
DECLARE @TeacherBLOB TABLE(TeacherBLOBID INT IDENTITY,TeacherID INT /*FK*/, TeacherBLOB XML);
INSERT INTO @TeacherBLOB VALUES
 (1,'<Teacher>
    <TeacherClass>
        <FormRoom> Room A</FormRoom>
        <TotalStudents> 25 </TotalStudents>
        <Subject> Mathematics </Subject>
            <Student>
                <StudentName> James </StudentName>
                <StudentAge> 15 </StudentAge>
                <StudentAddress> </StudentAddress>
            </Student>
    </TeacherClass>
</Teacher>')
,(1,'<Teacher>
    <TeacherClass>
        <FormRoom> Room B</FormRoom>
        <TotalStudents> 20 </TotalStudents>
        <Subject> Physics </Subject>
            <Student>
                <StudentName> Jane </StudentName>
                <StudentAge> 13 </StudentAge>
                <StudentAddress> Some address </StudentAddress>
            </Student>
            <Student>
                <StudentName> Tim </StudentName>
                <StudentAge> 14 </StudentAge>
                <StudentAddress> Some address </StudentAddress>
            </Student>
    </TeacherClass>
</Teacher>')
,(2,'<Teacher>
    <TeacherClass>
        <FormRoom> Room B</FormRoom>
        <TotalStudents> 20 </TotalStudents>
        <Subject> German </Subject>
            <Student>
                <StudentName> Hugo </StudentName>
                <StudentAge> 14 </StudentAge>
                <StudentAddress> Some address </StudentAddress>
            </Student>
            <Student>
                <StudentName> Max </StudentName>
                <StudentAge> 13 </StudentAge>
                <StudentAddress> Some address </StudentAddress>
            </Student>
    </TeacherClass>
</Teacher>');

--第一个查询读取TeacherClass

SELECT t.Name
      ,tc.query('.') AS TeacherClassXML
      ,tc.value('FormRoom[1]','nvarchar(max)') AS FormRoom
      ,tc.value('TotalStudents[1]','int') AS TotalStudents
INTO #TeacherClass
FROM @Teacher AS t
INNER JOIN @TeacherBLOB AS tb ON t.TeacherID=tb.TeacherID
OUTER APPLY tb.TeacherBLOB.nodes('/Teacher/TeacherClass') AS A(tc);

--第二个查询读取主题

SELECT tc.*
      ,s.query('.') AS SubjectXML
      ,tc.TeacherClassXML.value('(TeacherClass/Subject)[1]','nvarchar(max)') AS [Subject]
INTO #Subject
FROM #TeacherClass AS tc
OUTER APPLY tc.TeacherClassXML.nodes('TeacherClass/Subject') AS B(s) 

--这个查询读取学生

SELECT tc.*
      ,tc.TeacherClassXML.value('(TeacherClass/Subject)[1]','nvarchar(max)') AS [Subject]
      ,st.query('.') AS StudentXML
      ,st.value('StudentName[1]','nvarchar(max)') AS StudentName
      ,st.value('StudentAge[1]','int') AS StudentAge
      ,st.value('StudentAddress[1]','nvarchar(max)') AS StudentAddress
INTO #Student
FROM #TeacherClass AS tc
OUTER APPLY tc.TeacherClassXML.nodes('TeacherClass/Student') AS B(st) 

--检查内容

SELECT * FROM #TeacherClass;
SELECT * FROM #Subject;
SELECT * FROM #Student;

--清理测试

GO
DROP TABLE #Student;
DROP TABLE #Subject;
DROP TABLE #TeacherClass;

在清理之前你必须放置你的代码来填充你的真实表格。